.header{
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    height: 100%;
    padding-top: 57px;
    background: url(./bg.jpg) no-repeat;
    /* cover背景图片完全覆盖背景区域 */
    background-size: cover;
}
.header-title{
    margin-bottom: 17px;
    color: #fff;
    font-size: 18px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}
.header-layout .searchbox{
    width: 89.333333%;
    background-color: rgba(0, 0, 0, 0.5);
}